Someday, I'll be a real modeler...

How can I master financial modeling? I'm a first-year analyst at a small investment bank. We had internal training in financial modeling (rather than contracting to an outside firm for classroom training), and I left feeling confused and wanting to really grasp it. Although I majored in finance and have an IT background, I never had the opportunity to really build a model from scratch myself. I'm interested in learning to build DCF, M&A, and LBO models. My grounding in accounting is relatively solid, though a bit of review wouldn't hurt. I've been looking into courses in my area (NYC) and they seem to run $2,000 or so a course. I'd try to teach myself, but I have a short attention span, relatively limited free time, and am not sure I could seriously dedicate myself to learning without professional instruction. I'd also like to wipe it out over the course of a few weekends, so the courses seem ideal in that regard due to their compressed format. So, should I bite the bullet and shell out $2K for each course (each teaching one concept, like just DCF, or just Public Comps), or are there other alternatives I should be considering? Thanks!